GB642691A - Improvements in or relating to electric wave filters - Google Patents

Improvements in or relating to electric wave filters

Info

Publication number
GB642691A
GB642691A GB30933/47A GB3093347A GB642691A GB 642691 A GB642691 A GB 642691A GB 30933/47 A GB30933/47 A GB 30933/47A GB 3093347 A GB3093347 A GB 3093347A GB 642691 A GB642691 A GB 642691A
Authority
GB
United Kingdom
Prior art keywords
impedance
section
prototype
sections
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB30933/47A
Inventor
Hector Thomas Prior
Thomas William Fisher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB642691A publication Critical patent/GB642691A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1766—Parallel LC in series path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1775—Parallel LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezo-electric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezo-electric or electrostrictive material including passive elements

Abstract

642,691. Electric filters. STANDARD TELEPHONES & CABLES, Ltd. Nov. 21, 1947, No. 30933. [Class 40 (viii)] An electric filter consists of one or more crystal element sections, having image impedances of the m-derived type, connected in tandem, and terminated at each end by a coil and condenser network having prototype image impedance facing the crystal section, the latter having a cut-off frequency which lies between the specified pass-band of the filter and the corresponding cut-off frequency of the coil and condenser network. In an example, crystal sections 1 and 2 have m-derived type impedance and are terminated at one end by a half-section 3 of ladder type coil and condenser filter having prototype impedance facing section 2 and mtype impedance at the other end. The other end is terminated by two ladder sections 4 and 5 having prototype impedance and a half ladder section 6 with prototype impedance facing section 5 and m-derived type impedance at the other end. In its simplest form the filter would consist only of sections 6, 1 and 3.
GB30933/47A 1947-11-21 1947-11-21 Improvements in or relating to electric wave filters Expired GB642691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB284199X 1947-11-21

Publications (1)

Publication Number Publication Date
GB642691A true GB642691A (en) 1950-09-06

Family

ID=10275333

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30933/47A Expired GB642691A (en) 1947-11-21 1947-11-21 Improvements in or relating to electric wave filters

Country Status (6)

Country Link
US (1) US2619535A (en)
BE (1) BE485845A (en)
CH (1) CH284199A (en)
FR (1) FR974809A (en)
GB (1) GB642691A (en)
NL (2) NL143184B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE519553A (en) * 1952-05-08
US5291159A (en) * 1992-07-20 1994-03-01 Westinghouse Electric Corp. Acoustic resonator filter with electrically variable center frequency and bandwidth
JP4463262B2 (en) * 2006-11-22 2010-05-19 富士通メディアデバイス株式会社 Filter device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1976481A (en) * 1931-08-20 1934-10-09 Bell Telephone Labor Inc Wave analysis
US2045991A (en) * 1931-09-19 1936-06-30 Bell Telephone Labor Inc Wave filter
US1969571A (en) * 1933-03-17 1934-08-07 Bell Telephone Labor Inc Transmission network
US2070677A (en) * 1934-06-09 1937-02-16 Bell Telephone Labor Inc Transmission network
US2216937A (en) * 1938-11-05 1940-10-08 Bell Telephone Labor Inc Wave filter

Also Published As

Publication number Publication date
NL75153C (en)
CH284199A (en) 1952-07-15
US2619535A (en) 1952-11-25
NL143184B (en)
BE485845A (en)
FR974809A (en) 1951-02-26

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